<font color="red"><u>'''NOTE: If you want to model a microstrip structure with a laterally infinite substrate and a laterally infinite ground plane, make sure to set the domain offsets in the ±X, ±Y and -Z directions equal to zero.'''</u></font>
[[Image:FDTD50.png|800px]]
Figure 1: A microstrip line port on a substrate terminated from the bottom by a PEC boundary plane.